Syringe



United States Patent O 3,114,376) SYRINGE Rey A. Kayler, Rte. Z, Box 214, Moses Lake, Wash. Filed lieb. 23, 1962, Ser. No. 175,163 3 Claims. ((Il. 12S-213) This invention relates to improvements in syringes and more particularly to syringes designed for the hypodermic injection o a liquid medicament into livestock such as cattle, horses, sheep and thelilre. Specifically stated, the present invention pertains to tre provision of an irnproved form of hypodermic syringe to be used by cattlemen primarily for the treatment of various diseases or sicknesses of cattle.

lt is one of the principal objects of this invention to provide a safe and practical syringe for the above stated purpose that does not require the usual corralling, capturing and securing the animals for the reception of injections from the syringe; which is relatively simple in its construction and mode of use and which can be easily used on an animal by a rider on horseback or while riding in an automobile or other vehicle.

lt is also a principal object of the present invention to provide a syringe of the general hypoderrnic type; that is characterized by use of a plunger therein that may be retracted against and held under spring pressure or tension for its automatic release to effect injection of the medicament thcretrorn incident to the pressure applied by the user in projecting the hypodermic needle of the syringe into the animal.

Further objects and advantages of the invention reside in the details ot construction of the various parts comprised in the syringe; in their combination and in the mode of use of the syringe, as will hereinafter be described.

In accomplishing the above mentioned and other objects of the invention, I have provided the improved details of construction, the preferred forms of which are illustrated in the accompanying drawings, wherein:

FlG. l is a side view of the present syringe, showing its parts as adjusted and held in readiness for the injection of a charge of medication therefrom into an animal.

FlG. 2 is a similar View showing the position to which the movable parts of the syringe have been actuated by the injecting operation.

FG. 3 is an enlarged, longitudinal section of the syringe taken in its axial line; showing the cylinder thereof as charged with a medicament and the plunger set ready for the discharge of the medicament.

FlG. 4 is a cross-section, taken on line d-d in FIG. 3, showing the plunger retaining latches in their plunger holding positions.

FlG. 5 is a cross-section taken on line 5-5 in FlG. 4.

FlG. 6 is a cross-section on line 5 6 in FIG. 3 showing the outer or closed inner end of the syringe.

FlG. 7 is a View showing the outer or needle carrying end elevation of the syringe as seen in FIG. 3.

FlG. 8 is aview showing the manner of mounting the syringe on an elongated handle member for its more convenient use by a rider.

Referring more in detail to the drawings:

The present syringe is designated in its entirety in FIGS. l, 2 and 3 by reference numeral l@ wherein it is shown to comprise a tubular or barrel-like body portion ll; an outer end portion 12 hereinafter referred to as the tip and an inner end cap portion i3. The cap portion is made up of two concentric, disk-like portions la and 13b later to be described in detail.

The barrel-like body ll is a single, plastic piece of cylindrical form, that is axially bored from its inner to near its outer end, thus to provide an elongated cylindrical chamber l5 that terminates short of the outer end EAM-,did

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of the body in a closure endwall i6 that has a central bore therethrough, as at t7, and this bore has a needle mounting tip l threaded thereinto. This tip is axially bored to provide a discharge passage i9 therethrough and its outer end is tapered to provide a mounting tip lx over which the hub 23h ot a hypodermic needle Ztl suitable for this syringe may be applied for use.

The tip portion l2 of the syringe is tubular or cylindrical and of the same outside diameter as the barrel il and it is shown to have its outer end portion conically tapered but not necessarily so.

rEhe inner end cap i3, of the barrel ll, as made up by the two disks 13a and i311 which are of the same diameter as the barrel, is secured firmly in place over the open inner end oi the barrel by tour screws 22, best shown in FG. 6 to be equally angularly spaced and as illustrated in TFG. 5 are applied through both disks and threaded at their inner ends into the end portion ot the barrel and drawn tight.

The tip end portion l2 is mounted by two elongated rods 25 that extend slidably through holes 2d bored through the cap t3; thence through. bores 27 formed in diarnexically opposite sidewall portions of the barrel, throughout its entire length and are then threaded into the end surface of the tip, as seen at 23 in FIG. 3. When the tip l2 is pressed iirmy against the closed outer end surface of barrel or body il, the other ends of these two rods 25 will each project approximately 5/16 of an inch beyond the inner end surface of cap i3 as shown in FiG. 2. When the tip is pulled outwardly and away from the barrel, the heads oi the rods 2S are engaged against the cap as in FiG. 3.

it is also well shown in FlG. 3 that a plunger Si) of lesser diameter than tire cylindrical chamber l5 and formed with a piston-like inner end portion 36x is reciprocally contained in the bore l5, with the outer end portion of the plunger stem extended slidably through bores 32 and 33 formed centrally through the disks i3d and i311 to receive it. The piston-like inner end portion Flix of the plunger is equipped with a suitable sealing gasket, as at 35, and a coil spring 36 is applied about the plunger to bear at its inner and outer ends, respectively, against the piston-like portion Stix and end plate i3d to urge the plunger inwardly.

To charge the barrel chamber i5 with a medicament, the needle 2b, after being properly applied to the mounting tip idx is inserted in the liquid medicament and is caused to be sucked into the barrel by drawing the plunger outwardly to its limit. When the plunger has been pulled outwardly to a predetermined extent, it will be latched and held in readiness for use by the present latching means. rifhe plunger latching means and its method of release will now be described.

It is to be observed by reference to FiGS. 4 and 5, that the outer surface of disk ida is slightly recessed. Disposed iiatly against the bottom surface of the recess, at opposite sides of the plunger' containing bore therein are paired latch dogs id-45d, each of which is pivotally mounted between its ends by a pivot pin il that is iixed in the disk. The plunger stem 3b is shown in FIG. 3 to be formed at a predetermined distance from the piston end portion Stix thereof with a shallow encircling groove When the plunger 3b is pulled outwardly to position oi HGB to eiiect the sucking in oi the charge of medicament, and the coil spring 35 is thereby placed under cornpression, it will be held in that cocked or latched position by the two latch dogs itldil which are caused to have end portions thereoi seated, as in FlG. 4, within the encircling channel l2 of the plunger; the inward urging of the dogs for latching is effected by the use of V-shaped spring means that are disposed in the recessed portion of the disk llra in iixed positions and in such manner as to exert latching pressure against the outer edges oi the latching ends thereof.

To prepare the syringe for use, the tip portion 12 is rst pulled outwardly and away from the closed end or" the barrel, as in FiG. l. in doing this the heads 25h of the two tip mounting and holding rods 25 are caused to be seated against the Cap 13 as they have been shown in FlG. 1. Each of the rods 25 is formed lengthwise thereof along that portion adjacent its head 2.5/2, with a sloping camminf7 surface S6, as well shown in FIG. 5. When the two rods 25 are moved outwardly by manually pulling the tip 12 to its outer position as shown in FIG. l, the camming surfaces of the rods recede suiiciently under spring pressure to permit the subsequent latching of the dogs in the plunger channel For the injection oi the medicament into the animal, the needle point is forced into the animal in such manner and to such extent as to simultaneously press the tip 12 baci: against the end of the barrel, and in doing this the two rods 25 which mount the tip are actuated outwardly, thus causing their sloping camming surfaces to so act against the dogs as to unseat their latched ends from the plunger channel to allow the coil spring to force the plunger and piston inwardly and effect the discharging of the medicament from the chamber 15 and through the needle into the animal.

it is the experience of persons who have used the present syringe for treatment of sich or diseased cattle, that it is most satisfactory and convenient for a rider on horseback or in a buggy or automobile, to ride into a herd alongside the animal and to use it for injection of medication, either while tightly grasping the syringe barrel in the hand, or by attaching a rod or pole d@ of suitable length to the barrel as in FIG. 8. Such a pole could be of any suitable length and` attached at one end to the outer side of the syringe barrel l@ in any suitable manner, as for example, by use or an ordinary hose clamp 61 or the lilte as indicated. Also, it is apparent that the plunger' powering spring 35 might be placed at the outside of the barrel ll instead of inside it as herein shown and secured thereto at one end and to the outer portion o the plunger stem at its other end in such manner as to be placed under tension with the charging of the syringe.

Materials used in the making of the various parts of the device would 'oe selected to best serve the purpose, without change in the use of the syringe and without endangering the medicament or the article. For instance, the barrel might be made or" plastic, stainless steel, glass or other suitable materials, Likewise, the size of the device and proportional dimensions ot its parts might be changed to suit conditions of use without departing from the spirit of the invention.

What l claim as new is:

1. A syringe for injecting a medicant into a body comprising a barrel having a piston chamber therein adapted to be lled with said medicant and having outer and inner ends adjacent to the ends of said chamber, a hypoderrnic needle rigidly connected to said outer end, said needle projecting outwardly from said barrel and being in communication with said piston chamber, a piston slidably and sealingly fitted within said chamber for reciorocating movement within said chamber, a ported disc secured over the inner end of said barrel, an extension connected to said piston and projecting through and rearwardly of ysaid ported disc, a spring means connected between said piston and barrel so as to urge said piston toward said needle for forcing the medicant in said chamber through .said needle, said extension'having a peripheral groove "termed therein, a latch pivotally mounted to said disc, ent means urging a portion of said latch towards l extension whereby said portion may extend into said eove for retaining said piston in a position to hold said 'ng means compressed, an annular tip surrounding said Vneedle and spaced between the outer end of said needle and said outer end of said barrel when said latch portion extends into said groove, support means movably connecting said tip to said barrel so that said tip may move toward and away from said outer end of said barrel, latch operating means connected to said support means and adapted to move said portion of said latch out of said groove when said tip contacts said body and is forced t wards said barrel whereby said spring means may move said piston to force said medicant through said needle.

2. A syringe as delined in claim 1 wherein said support means comprises an elongated rod slidably mounted in a bore through said barrel, one end of said rod secured to said tip, said latch operating means comprising a cam surface on the other end of said rod adapted to engage said latch and force said latch portion out of said groove when said rod and cam surface are moved inwardly by said tip.

3. A syringe as defined in claim 1 including an elongated handle means connected to said barrel whereby said syringe may be moved by said handle means for forcing said hypodermic needle into said body.

References Sited in the le of this patent UNlTED STATES PATENTS 

1. A SYRINGE FOR INJECTING A MEDICANT INTO A BODY COMPRISING A BARREL HAVING A PISTON CHAMBER THEREIN ADAPTED TO BE FILLED WITH SAID MEDICANT AND HAVING OUTER AND INNER ENDS ADJACENT TO THE ENDS OF SAID CHAMBER, A HYPODERMIC NEEDLE RIGIDLY CONNECTED TO SAID OUTER END, SAID NEEDLE PROJECTING OUTWARDLY FROM SAID BARREL AND BEING IN COMMUNICATION WITH SAID PISTON CHAMBER, A PISTON SLIDABLY AND SEALINGLY FITTED WITHIN SAID CHAMBER FOR RECIPROCATING MOVEMENT WITHIN SAID CHAMBER, A PORTED DISC SECURED OVER THE INNER END OF SAID BARREL, AN EXTENSION CONNECTED TO SAID PISTON AND PROJECTING THROUGH AND REARWARDLY OF SAID PORTED DISC, A SPRING MEANS CONNECTED BETWEEN SAID PISTON AND BARREL SO AS TO URGE SAID PISTON TOWARD SAID NEEDLE FOR FORCING THE MEDICANT IN SAID CHAMBER THROUGH SAID NEEDLE, SAID EXTENSION HAVING A PERIPHERAL GROOVE FORMED THEREIN, A LATCH PIVOTALLY MOUNTED TO SAID DISC, RESILIENT MEANS URGING A PORTION OF SAID LATCH TOWARDS SAID EXTENSION WHEREBY SAID PORTION MAY EXTEND INTO SAID GROOVE FOR RETAINING SAID PISTON IN A POSITION TO HOLD SAID SPRING MEANS COMPRESSED, AN ANNULAR TIP SURROUNDING SAID NEEDLE AND SPACED BETWEEN THE OUTER END OF SAID NEEDLE AND SAID OUTER END OF SAID BARREL WHEN SAID LATCH PORTION EXTENDS INTO SAID GROOVE, SUPPORT MEANS MOVABLY CONNECTING SAID TIP TO SAID BARREL SO THAT SAID TIP MAY MOVE TOWARD AND AWAY FROM SAID OUTER END OF SAID BARREL, LATCH OPERATING MEANS CONNECTED TO SAID SUPPORT MEANS AND ADAPTED TO MOVE SAID PORTION OF SAID LATCH OUT OF SAID GROOVE WHEN SAID TIP CONTACTS SAID BODY AND IS FORCED TOWARDS SAID BARREL WHEREBY SAID SPRING MEANS MAY MOVE SAID PISTON TO FORCE SAID MEDICANT THROUGH SAID NEEDLE. 